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74F646A Datasheet(PDF) 6 Page - NXP Semiconductors |
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74F646A Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 16 page Philips Semiconductors Product specification 74F646/A/74F648/A Transceivers/registers 1990 Sep 25 6 The following examples demonstrate the four fundamental bus–management functions that can be performed with the 74F646/646A and 74F648/648A. The select pins determine whether data is stored or transferred through the device in real time. The output enable pins determine the direction of the data flow. BUS MANAGEMENT FUNCTIONS REAL TIME BUS TRANSFER BUS B TO BUS A REAL TIME BUS TRANSFER BUS A TO BUS B STORAGE FROM A, B, OR A AND B TRANSFER STORED DATA TO A AND/OR B OE DIR CPAB CPBA SAB SBA LL X X X L BUS A BUS A BUS A BUS A BUS B BUS B BUS B BUS B OE DIR CPAB CPBA SAB SBA LH X X L X OE DIR CPAB CPBA SAB SBA XX ↑ XX X XX X ↑ XX HX ↑↑ XX OE DIR CPAB CPBA SAB SBA L L X H or L X H L H H or L X H X SF00392 |
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